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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.commons.math.random;
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* This class implements a normalized uniform random generator.
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* <p>Since it is a normalized random generator, it generates values
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* from a uniform distribution with mean equal to 0 and standard
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* deviation equal to 1. Generated values fall in the range
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* [-√3, +√3].</p>
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* @version $Revision: 615734 $ $Date: 2008-01-27 23:10:03 -0700 (Sun, 27 Jan 2008) $
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public class UniformRandomGenerator implements NormalizedRandomGenerator {
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/** Create a new generator.
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* @param generator underlying random generator to use
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public UniformRandomGenerator(RandomGenerator generator) {
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this.generator = generator;
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/** Generate a random scalar with null mean and unit standard deviation.
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* <p>The number generated is uniformly distributed between -&sqrt;(3)
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* @return a random scalar with null mean and unit standard deviation
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public double nextNormalizedDouble() {
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return SQRT3 * (2 * generator.nextDouble() - 1.0);
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/** Underlying generator. */
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private RandomGenerator generator;
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/** Square root of three. */
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private static final double SQRT3 = Math.sqrt(3.0);